Catalyst for macro-porous oxide supported core-shell structure nanoparticles and preparation method of catalyst

Abstract

The invention relates to a catalyst for macro-porous oxide supported core-shell structure nanoparticles and a preparation method of the catalyst. The catalyst for the macro-porous oxide supported core-shell structure nanoparticles is obtained by using a simple oxide with a three-dimensional macro-porous structure as a supporter to support the core-shell structure nanoparticles; the core of the core-shell structure nanoparticles is noble metal; the shell material of the core-shell structure nanoparticles is one or combination of more selected from rare earth elements and transitional metal elements; the simple oxide is the catalytically inactive oxide; the average pore size of the macro-pore of the supporter is 50nm to 1mu m. The invention also provides a preparation method of the catalyst. Compared with a corresponding general catalyst, a nanoparticle catalyst and a three-dimensional ordered macro-porous oxide catalyst, the oxidation catalyst, prepared by supporting noble metal (core)-rare earth element or transitional metal element (shell) active component by the simple oxide with a three-dimensional ordered macro-porous structure, has higher catalytic activity.

Description

technical field [0001] The invention relates to a catalyst for macroporous oxide-loaded core-shell structure nanoparticles and a preparation method thereof, and belongs to the technical field of oxidation catalysts for combustion of soot particles emitted from diesel vehicles. Background technique [0002] Improving the activity of the catalyst for purifying soot particulate matter (PM) from diesel vehicle exhaust, reducing the combustion temperature of soot particulate matter, so that the soot particulate matter trap can work continuously for a long time is the most direct way to reduce the emission of soot particulate matter from diesel engines method. Since the elimination reaction of soot is a gas-solid (soot)-solid (catalyst) three-phase complex deep oxidation reaction process, the improvement of catalyst activity is not only closely related to the redox performance of the oxide catalyst itself, but also to the solid The contact degree of catalyst and PM is closely rel...

AI Technical Summary

Problems solved by technology

For example, problem one, the preparation process can easily destroy the structure of the existing three-dimensional ordered macroporous oxide

The second problem is that noble metal particles are not easy to be evenly loaded on the inner surface of the macroporous carrier, which makes the distribution of noble metal particles inside and outside the bulk catalyst uneven, which affects the evaluation of catalytic activity

The third problem is that during the use of the catalyst, under high temperature conditions, the active components of the noble metal are easy to agglomerate, resulting in a decrease in the activity of the catalyst and a decrease in the stability of the catalyst

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